If [itex]\hat{U}(r) = e^{\hat{A}(r)}[/itex], can we say [itex]\frac{d\hat{U}}{dr} = \frac{d\hat{A}}{dr}e^{\hat{A}(r)}[/itex]?(adsbygoogle = window.adsbygoogle || []).push({});

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# Differential of exponential operator

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